fn main() {
    let arr1: [i32; 5] = [1, 2, 3, 4, 5];
    let arr2 = [1, 2, 3, 4, 5];
    let arr3: [i32; 5] = [1; 5];
    let arr4 = [1; 5];

    println!("arr1:{:?}", arr1);
    println!("arr2:{:?}", arr2);
    println!("arr3:{:?}", arr3);
    println!("arr4:{:?}", arr4);

    println!("arr1[0]:{}, arr3[2]:{}", arr1[0], arr3[2]);


}
